A fire‐truck is travelling West at 40 m/s. A policeman is behind the fire‐truck and is running West at 5m/s. Bill and Ted are riding on the fire‐truck. There is no wind
Ted’s water hose can shoot water at 20m/s. Ted turns on the water to try and get Bill wet. With what speed does Bill observe the water come out of the hose?
Bill shouts at Ted to stop the water. With what speed does the Policeman detect the sound waves?
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sorry I don't know answer
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